Ecma-48 proposed styling controls update updated & math expression representation proposal update

[William_J_G Overington]

Previously I wrote:

> MORE NEEDED about Anne showing Patricia how to code the text in green 
> and yellow.

I managed to download the PDF document to local storage and I have found 
on page 55 of the PDF document a table with codes in Kent's proposed 
enhanced system for setting the colours to alphanumerics green and 
alphanumerics yellow so that writing of the story can make progress.

It appears that for alphanumerics green SP? CSI 92m is needed and that 
for alphanumerics yellow that SP? CSI 93m is needed. I expect that the 
code alphanumerics green will be needed at the start of the line and 
after the name Gutenberg and that alphanumerics yellow will be needed 
before the name Gutenberg. A teletext alphanumerics colour code 
automatically generates a space in the display, so I am wondering if, 
for the possibility of making round-trip conversion back to teletext 
format that the space should be after the code rather than before it as 
is listed in Kent's document so that in a round trip the space following 
the colour code can be omitted when it is reached rather than needing to 
go back and remove it when the colour code is detected.

I do not currently know what CSI means in this context. There are 808 
mentions of CSI is the PDF document and the first one is on page 6 but 
at present I do not understand it.

I am thinking that if this story can be completed and includes a 
reference to Kent's document and Anne and Patricia have a discussion 
about why Anne thinks it better to have the space after the colour code 
rather than before then the story might well be a good learning 
resource.

William

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